I hoping to get some help with some wiring on a installation I'm working on of a Bell Systems 551C and a Melco KT19. I've never worked on 1A2 and am stuck on wiring for the Melco Intercom. I've completed the 551C install and it's working fine. I installed the Melco today but couldn't get much working. When I was done I was only getting a single click on the buzzer (KS-20419 buzzer on 2564 phones)of a two of eight phones and I had a had hum on the talk path on all phones. I hooked up 110v from 551c (RG & RB) to AUD SUP and GRD on Melco, then 24vdc from 551c (GB and BB)to A BAT and A GRD, B BAT and B GRD, then T & R to each 2564 phone Line 5 T & R. The Melco instructions say filtered 24vdc to A BAT. Is filtered needed? Any ideas on clicking problem with buzzer or problems withhum on talk path?
